| 太赫兹双芯光子带隙光纤定向耦合器 |
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| 引用本文： | 白晋军,王昌辉,侯宇,范飞,常胜江.太赫兹双芯光子带隙光纤定向耦合器[J].物理学报,2012,61(10):108701-108701. |
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| 作者姓名： | 白晋军 王昌辉 侯宇 范飞 常胜江 |
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| 作者单位： | 1. 天津工业大学电子与信息工程学院,天津,300387
2. 南开大学现代光学研究所,天津,300071 |
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| 基金项目： | 国家高技术研究发展计划(863计划) (批准号: 2011AA010205)、国家自然科学基金(批准号: 61171027)、 天津市自然科学基金重点项目(批准号: 10JCZDJC15200)和教育部博士点基金(批准号: 20090031110033)资助的课题. |
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| 摘 要： | 提出了一种低损耗、宽频段太赫兹双芯光子带隙光纤定向耦合器,光纤的包层由亚波长尺度呈三角晶格排列的空气孔组成, 两个纤芯分别由去掉7个空气孔构成.利用全矢量有限元法对光纤的色散、耦合特性以及损耗特性进行了理论分析. 研究表明,这种耦合器的损耗系数小于0.021 cm-1,更重要的是可以实现0.14 THz范围内的宽频定向耦合. 这种定向耦合器在太赫兹通信系统中滤波、波分复用、偏振分离和开关等技术中有潜在的应用价值.
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| 关 键 词： | 太赫兹 太赫兹光子带隙光纤 光纤耦合器 耦合长度 |
| 收稿时间： | 2011-06-27 |
Terahertz dual-core photonic band-gap fiber directional coupler |
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| Bai Jin-Jun,Wang Chang-Hui,Hou Yu,Fan Fei,Chang Sheng-Jiang.Terahertz dual-core photonic band-gap fiber directional coupler[J].Acta Physica Sinica,2012,61(10):108701-108701. |
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| Authors: | Bai Jin-Jun Wang Chang-Hui Hou Yu Fan Fei Chang Sheng-Jiang |
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| Institution: | 1. School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300160, China;2. Institute of Modern Optics, Nankai University, Tianjin 300387, China |
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| Abstract: | A low-loss and broadband terahertz twin-core photonic band-gap fiber directional coupler is proposed, which consists of a cladding with a triangular lattice array of sub-wavelength air rods and two cores formed respectively by omitting seven nearby air rods. The group velocity dispersion, the coupling and the loss of the fibers are investigated by using a full-vector finite element method. The numerical simulations show that the loss coefficient of the coupler is less than 0.021 cm-1, and the coupling broadband of 0.14 THz can be realized. The directional coupler has potential applications in terahertz communication systems, such as filtering, wavelength-division multiplexing, polarization isolation, switching and so on. |
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| Keywords: | terahertz terahertz photonic band-gap fiber fiber coupler coupling length |
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